Direct Coombs Test (DAT)

Hematology

Normal Reference Ranges

Adult

Negative Titer

Pediatric

Negative Titer

Clinical Significance

Detects antibodies or complement proteins bound to the surface of red blood cells. Crucial for diagnosing immune-mediated hemolytic anemias.

Causes of High

  • Autoimmune hemolytic anemia
  • Drug-induced hemolytic anemia
  • Hemolytic disease of the newborn (HDN)
  • Transfusion reaction

Causes of Low

  • Normal finding